well jumbo loan can not stop water comming in , infect nothing can stop water comming in , you need to seal off all the holes and i have mention that in my post , i guess there will be 3 ways of water comming in ,,,,one is the AC evaporator ,,,,,,,,,,,,,,,it can easily be fixes , ,,,,,i have seen that drain pipe is originally not fitted with any clamp so you can clamp it down so that it wont leak , and this happens with me few years before in my other cultus , the frount left seat carpet is always seems wet , and then i spoted this problem and fix it , since then no such issue,,,,,,,,,,,,,,second is that you spill water on carpet ,,,,,,,,,,,,obviously no solution for that you have to avoide that , i guess childrens spill drinks or water ,,,,,,,you can lay down a plastic sheat under the carpet , i have that idea before but i have no plastic sheat left at that time when i was laying the carpet , may be i will lay it down from end to end without any joint when i change the seat covers ,,,,,,,,,,,,,,,,,third is when you wash your car ,,,,,,,,,,,,they wash the underneat with pressured water ,,,,,,,,,,,,,,which can eaily leak from the drainage holes , and i have seen that pressure water can easily blow the drain hole cap away,,,,,,,,,,,,,,,so i came with a fix ,,,,,,,,,,,,i mount the caps from the underside of car instead of upper side ,,,,,,,,,,,,,,,,,,,,,check thsi pic,,,,,,,,,,,,,,,,,,then later i seal it with alminum tape ,,,,,,,,no leaks at all ,,,,,,,,,,,,and i can easily remove that cap if needed,,,,,,,,,,,,and that cap wont go off even with pressured water,,,,,,,,,,,,i use rubber caps ,,,,,,,,i have some spare caps and i guess these caps are of suzuki fx orininal japanese , the car which my dad sold away more than 12 years before but its spars are still saved in my store ,,,,,,,,,i hope it works for you
le